I have 9 appprox 9 week old Arucana??? chicks.. they are all well feathered and I have been told you can sex them by their tails??? I will try and get a pic later.. they all have quite straight long tails that stick straight up/out.. What is the true way to sex these types of chicken?? 8 of the 9 are a lavender/grey colour and I have one brownish one..... all but one have wee tufts on their heads??